GMC Sierra 2500HD (2014) is 802 mm (31.57 inch) longer, 176 mm (6.93 inch) wider, 456 mm (17.95 inch) higher and has 1158 liters (40.89 ft3) bigger cargo space than Opel Insignia Sports Tourer (2015).
Opel Insignia Sports Tourer (2015) is 1318 kg (2,906 lbs) lighter than GMC Sierra 2500HD (2014).